I wouldn't hold your breath on getting it to work. At least not reliably. With the frequency of patches and the launchers verification of core files (which I believe includes the DirectX DLL's) even if you got it to work at one point it's likely the next patch would just break it again.
Injectors and MMO's typically don't work well together.
My advice is to not use SweetFX at all. I had to look it up., since I had not heard of it. After doing so I can't think of a valid reason to use such software.
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Injectors and MMO's typically don't work well together.